// Java program to illustrate the concept of inheritance 
public class Bike {
  public static void main( String args[ ] ) {
    int gear   = Integer.parseInt( args[0] );
    int speed  = Integer.parseInt( args[1] );
    int height = Integer.parseInt( args[2] );
    int up     = Integer.parseInt( args[3] );
    int down   = Integer.parseInt( args[4] );
    int newH   = Integer.parseInt( args[5] );
    MountainBike mb = new MountainBike( gear, speed, height );
    mb.speedUp   ( up );
    mb.applyBrake( down );
    mb.setHeight ( newH );
    System.out.println( mb.toString( ) );
  }
}
// Base class 
class Bicycle { 
  // The Bicycle class has two fields. 
  public int gear; 
  public int speed; 
  
  // The Bicycle class has one constructor. 
  public Bicycle( int gear, int speed ) { 
    this.gear  = gear; 
    this.speed = speed; 
  }           
  // The Bicycle class has three methods. 
  public void applyBrake( int decrement ) { 
    speed -= decrement; 
  }          
  public void speedUp( int increment ) { 
    speed += increment; 
  }     
  // The toString() method to print info of Bicycle. 
  public String toString( ) { 
    return( "Number of gears is " + gear + "\n" +
            "Speed of bicycle is " + speed + "\n" ); 
  }  
} 
// Derived class 
class MountainBike extends Bicycle { 
  // The MountainBike subclass adds one more field. 
  public int seatHeight; 
  
  // The MountainBike subclass has one constructor. 
  public MountainBike( int gear, int speed, int startHeight ) { 
    // Invoking base-class (Bicycle) constructor 
    super( gear, speed ); 
    seatHeight = startHeight; 
  }       
  // The MountainBike subclass adds one more method. 
  public void setHeight( int newValue ) { 
    seatHeight = newValue; 
  }        
  // Override toString() method of Bicycle to print more info. 
  @Override
  public String toString( ) { 
    return( super.toString( ) + "Seat height is " + seatHeight ); 
  }
}